最病 A Compatible changes 口 Adding fields 口 Adding classes 口 Removing classes n Adding write Object /readObject methods o Removing write Object/readObject methods o Adding java.io Serializable Changing the access to a field a Changing a field from static to nonstatic or transient to nontransient Institute of Computer Software 2021/1/28 Nanjing UniversityCompatible changes  Adding fields  Adding classes  Removing classes  Adding writeObject/readObject methods  Removing writeObject/readObject methods  Adding java.io.Serializable  Changing the access to a field  Changing a field from static to nonstatic or transient to nontransient 2021/1/28 Institute of Computer Software Nanjing University 37